Testing Harmonics on some Baofengs (Old and New)
2 m spectrum captures — transmit power and harmonic spur levels for several Baofeng handsets, with and without filtering.
▶ 2026
Balanced Mixers: How LO and RF Become IF (and AF)
How a four-diode double-balanced ring mixer multiplies LO and RF to produce intermediate-frequency products at the sum and difference of the two input tones — from classic 455 kHz superhets to direct-conversion receivers where the IF sits near DC and audio.
How many Drake 2Bs were ever made?
# How Many Drake 2-Bs Were Ever Made? Counting Boatanchors with the German Tank Problem It started, as these things do, with Bill (N2CQR) thinking out loud. On an episode of the *SolderSmoke* podcast he wondered how many Drake 2-B receivers the R.L. Drake Company had ever actuall
▶ 2024
Analyzing the WWV/WWVH Time Signal on 15 MHz
At the start of every UTC minute, WWV and WWVH each transmit an 800 ms pulse on 15 MHz — often both audible at once. By stacking those pulses and fitting a smooth envelope model, we can read off their relative delay and watch WWVH fade while WWV stays steady.